In uk.rec.motorcycles Morgans wrote:

The anti-auto (or truck) engine crowd will never admit that one of these
engines would work well, and be reliable in an airplane. I get so tired of
the "they never run at full output in autos" way of thinking.

I still would rather get in an auto engine conversion airplane that has had
the bugs worked out, than any airplane with a rotax engine of any size.

There is a fundamental problem, any auto engine is designed to deliver
purely rotational power from the crankshaft to the transmission.
In aero applications the prop is applying the entire power of the engine
trying to pull the crankshaft forward out of the block. That needs some
serious thrust bearings which auto engines simply do not have.

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03 GS500
66 Velocette LE Mk3
68 Bantam D14S
81 CB250RS